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[Iasonm <>]

When I build CGAL using the github repository (using the sequence of commands
cd cgal->cmake . ->make -> sudo make install) I get the following error when
trying to use a function from CGAL/Polygon_mesh_processing/measure.h (I am
using area and volume):

/usr/local/include/CGAL/Polygon_mesh_processing/measure.h: In instantiation
of ‘typename CGAL::GetGeomTraits<TriangleMesh,
CGAL::pmp_bgl_named_params&lt;T, Tag, Base> >::type::
FT CGAL::Polygon_mesh_processing::volume(const TriangleMesh&, const
CGAL::pmp_bgl_named_params<T, Tag, Base>&) [with TriangleMesh =
CGAL::Surface_mesh<CGAL::Point_3&lt;CGAL::Si
mple_cartesian&lt;double> > >; T = bool; Tag =
CGAL::internal_np::all_default_t; Base = boost::no_property; typename
CGAL::GetGeomTraits<TriangleMesh, CGAL::pmp_bgl_named_param
s&lt;T, Tag, Base> >::type::FT = double]’:
/usr/local/include/CGAL/Polygon_mesh_processing/measure.h:533:18:   required
from ‘typename CGAL::Kernel_traits<typename
CGAL::property_map_value<PolygonMesh, boost::vertex_
point_t>::type>::Kernel::FT CGAL::Polygon_mesh_processing::volume(const
TriangleMesh&) [with TriangleMesh =
CGAL::Surface_mesh<CGAL::Point_3&lt;CGAL::Simple_cartesian&lt;double> >
 >; typename CGAL::Kernel_traits<typename
CGAL::property_map_value<PolygonMesh,
boost::vertex_point_t>::type>::Kernel::FT = double]’
../meshcontractor.cpp:50:62:   required from here aka
CGAL::Polygon_mesh_processing::volume(m_M);
*/usr/local/include/CGAL/Polygon_mesh_processing/measure.h:522:10: error:
‘exact’ was not declared in this scope
     exact(volume);*

I have tried different kernels but that did not help.
Unfortunately Ubuntu's distribution package is pretty old namely 4.7 and
thats why I need the source build.
Any ideas what might causing this?



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